why man is never completely satisfied?

actuly some mans are expect from other there is more deficalt to hendl them i think you becom fathful abou that guy after some time every thing becom fine

i think are the man that no knows to appreciate nothing, egoist and without faith bye myryam

I would say that it is society itself. From the time we are very young children into late adulthood, we are encouraged and "trained" to be ambitious - to always want something new, something different, that promises things may be better. This has the effect that even if we may be satisfied, it won't be too long before we are wanting something else. We are "trained" to be this way by society. We don't have to be though, if we want to be different, we can. :)